Herbicide technique: pre-emergent herbicides only through weeds radicle, coleoptile or hypocotyl absorbed wholesale bensulfuron methyl, and kill weeds bensulfuron methyl manufacturers, after the emergence of weeds in use, general herbicidal effect or no herbicidal effect is very low. Post-emergent herbicide can also use safe and effective in certain growth stages of weeds or crops. Herbicide technique: selective herbicide. Proper use of crop ground, can be reached only kill the weeds without harming the crop purposes. Herbicide. Such herbicides kill all plants have a role. Such herbicide limited recreational fields, idle land of herbicides.